A lot of stuff goes on during the operation of the many sophisticated vessels and rigs in the offshore business, one of them being helliops.  if you have a hundred or so people on your installation you will probably carry out sone sort of a crew change every day, and so must be prepared for the deck crew to have to put on their special gear and man the helideck while the helicopter lands, people get off and on and then leaves. If you are a long way from the beach the thing may need to be refuelled, in which case everybody has to get off. Here is a CHC helicopter on the helideck of the diving ship CSO Venturer back in 2005.  

Photo by Tim McLeod and posted here on 19th April 2018.

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